"It doesn't matter if Rangers are in or out. The pressure is still there. It was there at the start of the cup and it's still there now. The players enjoy playing with that pressure and will be looking forward to the game.

"We are just taking it one game at a time but obviously it makes the competition easier now that Rangers are out. There are still some good teams in there and Dundee United is going to be a tough game. I think if we get through this one, we've got a good chance of progressing to the final.

"It's a tough draw but we're feeling confident at the moment and we just have to go into the game fully confident and I think we've got a good chance of getting the result that we need.

"The result [on Sunday] will give them great confidence but we are on a great run just now and I'm sure we can keep it going. Dundee United deserved it, they played well and they are a good team.

"I'm sure when we play against them, the game will be just as tough. We are just focusing on the job ahead."

On Celtic again missing a home tie, he said: "It's a hard place to go to and it's quite intimidating. But we have been there and won this season already so we are fully confident we can go there again and get the result we need."

A couple of other all SPL ties are possible, with Aberdeen playing Motherwell if the Dons see off First Division Queen of the South in a replay and St Mirren, if they win a replay against Ross County, facing either Hearts or St Johnstone.

Hibernian travel to Ayr United or Falkirk, who will play their fifth-round tie on February 15 after Saturday's match was postponed because the pitch was unplayable.

The three fifth-round replays will be played a day earlier on Feby 14, with the quarter-finals staged on the weekend of March 10-11.